Figuring out a semester or cumulative GPA by hand means weighting each grade by credit hours and averaging — small enough to do manually, tedious enough that mistakes creep in. OneConverter’s GPA calculator does the weighting automatically.
In short: Enter each course’s grade and credit hours — get your weighted GPA instantly.
Why credit-weighting matters
A 3-credit A and a 1-credit A don’t contribute equally to your GPA — credit hours weight each grade’s impact. Averaging grades without accounting for this gives an inaccurate result, which is the most common manual-calculation mistake.
Step-by-step
- Open the GPA Calculator on OneConverter.
- Add each course with its letter grade and credit hours.
- Repeat for every course in the term (or all terms for cumulative GPA).
- Get your calculated GPA instantly.
Try the GPA Calculator on OneConverter.io →
Check your school’s scale
GPA scales vary slightly between institutions (4.0 vs weighted scales for AP/honors classes) — confirm which scale your school uses before relying on the result for something official like a transfer application.